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Re: [Qemu-devel] [PATCHv2 1/3] target/arm: fix AArch64 virtual address s

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCHv2 1/3] target/arm: fix AArch64 virtual address space size
Date: Sun, 27 Jan 2019 10:47:44 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

On 1/25/19 10:52 PM, Rémi Denis-Courmont wrote:
> From: Remi Denis-Courmont <address@hidden>
> Since QEMU does not support the ARMv8.2-LVA, Large Virtual Address,
> extension (yet), the VA address space is 48-bits plus a sign bit. User
> mode can only handle the positive half of the address space, so that
> makes a limit of 48 bits.
> (With LVA, it would be 53 and 52 bits respectively.)
> The incorrectly large address space conflicts with PAuth instructions,
> which bits 48-54 and 56-63 for the pointer authentication code. This
> also conflicts with (as yet unsupported by QEMU) data tagging and with
> the ARMv8.5-MTE extension.
> Signed-off-by: Remi Denis-Courmont <address@hidden>
> ---
>  target/arm/cpu.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Richard Henderson <address@hidden>


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